those are Heat limited to 180F, watch out for Boils, ...... I wouldnt want boiling Wort to nail me or escape, and that is a big heat difference, from 180~212F ........ pressure wise as well too. Consider carefully.

I recommend the high temperature polysulfone quick disconnects even if they are somewhat pricey. They work extremely well. Whichever you choose, do not buy the ones with a shut-off because they restrict the flow quite a bit even when open.

I was thinking of using them for mash water, beverage lines, etc. Heck, they're cheap enough I'd even put them onto racking canes and stuff. I'm thinking of replacing my tubing with some of the really good stuff and using disconnects to connect it to everything. I'm guessing the male side is closed when it's disconnected, but what about the female?

The ones labeled "Straight" do not shut off (they are open), whether male or female. The ones labeled "Shut Off" are just that, and they close when disconnected. Like Bill said, they are highly restrictive. Also note that the largest size on that page is 3/8".

I would have a lot of those QD's if they came in 1/2". I'm having a hard time justifying the polysulfone QD's because they are so expensive. I'm just going to have to wait until complete frustration with hose barbs sets in.

The 60687 is PolyPROPYLENE, not Polysulfone. You want 60669, $9.36 each. But that's for pipe threads, as is the 60812. Where do your hoses go?

"Especially if the $3.58 fitting is used for everything except the in/out of the pump."

I'm trying to figure how that would work. You need to have either Males on all the vessels AND the pump, with females on the hose ends, or the other way around. The $3.58 fitting has male pipe threads, so you put it on the vessels and the pump, for a total of at least 6 (HLT, MLT, BK, Pump, Chiller (in). OK, so that's about $20, plus 4 of the 60674 (1/2" hose barb coupling body) to go on two hoses, and you're up to close to $60, plus shipping. And for those of us with RIMS or HERMS rigs, it's over $80.

What's the problem with 3/8" hoses and fittings? Assuming I don't have anything to match up yet, why would I be better of with 1/2" over 3/8"? Anything I pumped through 3/8" would already be SO much faster than siphoning with only 2 feet of head. The hoses and the fittings would all be cheaper as well. How much less flow would result?

1/2" ID hose has a cross-sectional opening of 0.196 inches, 3/8" is 0.110 inches. Add to that the increased head (friction), and the flow rate with 3/8" hose is less than half that of 1/2". It's actually worse than just the difference in the hose - barbed hose fittings get more restrictive as the size gets smaller, due to the material thickness of the barb.

They looks like the ones I've been using, but they didn't come from there. Mine cut off on both ends. I use a pair on my CO2 line and a bottle filler. They work great, but you can't take them apart, so clean immediately if you run beer through them.

I thought I was paying way too much when I looked at the US Plastics page, until I realized that they have shut off and non shut off versions. Definitely get the shut off kind.